Thermostat



(No Model.)

A. ROESCH.

THERMOSTAT.

No. 583,638. Patented June 1,1897.

n: norms refus co4 Pnofoumo, wAsuwoorou, o c` UNITED STATES PATENT OEETCE.

ALFRED ROESOII, OF BROOKLYN, NEWT YORK, ASSIGNOR OF TWO-THIRDS TO \VILLIAM B. IVADSIVORTII, OF PLAINFIELD, AND FREDERICK II. DAVIS, OF ELIZABETH, NEIV JERSEY.

THERMOSTAT.

SPECIFICATION forming part of Letters Patent No. 583,633, dated .Tune 1, 1897.

Application illed October 24, 1896 Serial No. 609,935. (No model.)

To alito/bom t may concern:

Be it known that I, ALFRED HOESCH, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York,have invented new and useful Improvements in Thermostats, of which the following is a speeiiication.

My invention relates to improvements in thermostats for regulating the temperature of ro buildings.

The objects of my invention are, first, to lnultiply or increase the power of athermostat; second, toinerease the range or length of movement of a thermostat, and, third, to provide improved means of adjusting the thermostat for various temperatures.

It is obvious that by combining two or more compound bars or thermostatic bends ot' a given strength and range of movement in a zo single series the power of the thermostat will be doubled or multiplied by two or more, in proportion to the number ot compound bars used in a series, while the length of movement would be no greater than that of a single compound bar. It is also obvious that by combining two or more series of such bars together the range or length of movement will be doubled or multiplied by two or more,in proportion to the number of series ot' conipound bars thus combined together. By my improvement I combine several compound bars in a sin-gle series to increase the power of movement, and I also combine several series of such compound bars together to in- 3 5 crease the range or length of movement.

The construction of my invention is further 'explained by reference to theaecompanying drawings, in which- Figure l representsa front view. Fig. 2 is 4o a side view. Fig. 3 is a cross-section drawn online @o a; of Fig. 2, and Figs. 4t and 5 are details.

Like parts are referred to by the saine reference-letters throughout the several views.

The thermostat proper consists of adouble series of compound bars A and a double series of compound bars B, which series A and B are composed of two sets of compound bars O and D, which are preferably formed in the 5o U shape shown. Each of the compound bars C and D is formed in the usual manner by uniting two plates d and I) ot' metal or other equivalent material of different expansibility. rlhe double series of compound bars A is supported from the long arm of the pivotal 55 lever E, to which they are secured by the bolts F, the lever E being made of sufficient width to support the series of com pound bars A. A top view of the lever E is shown in F et. 6o

The double series of compound bars B is supported from the free ends of the series otl bars A, to which they are secured by the bolts I and cross-bar J. The free ends ol the double series of the compound bars B are connected with the vibrating arm K by b'olts Il, the connected end of thc arm K being broadcned or made of suiiicien t width, as indicated in Fig. 5, to engage the free ends of all the compound bars in the upper series Il. 7o

N are separating-blocks which are interposed between the ends of the single compound bars O and D.

The supporting-lever E is pivoted to the standards O O ofthe thermostat-frame upon trunnions P I), and said lever and the compound bars A,supported thereoinare adjusted to conform to the various temperatures desired bythe bearing-screw Q and supportingspring l.. The screw Q is provided with an 8o indicati ng-arm S, by which it is turned downward or upward in its supporting screwthreaded bearing T. When said screw Q is turned downward against the short arm of the lever E, the compound bars are thrown upward by the long arm of said lever,whereby the desired action of the thermostatis accelerated, while by turning said lever in the opposite direction the opposite result is attained. An indicating-dial A', provided with 9o characters or marks, is located beneath said indicating-arm S, by which the adjustment of said arm is regulated.

The Jfree end of the arm K is adapted to actuate the air-controlling valves of a heatregulating system, and said valves are moved more or less promptly with greater or less power, according to the flexibility or rigidity of the compound bars te which it is attached. By diminishing the flexibility of the com- Too pound bars they act more promptly and with greater power. The compound bars are made more or less rigid, as desired, by the action of the spiral spring C', adjustable screw D', and hand-nut E', by which the lever E is connected with the valve-actuating rod II. It is obvious that by drawing up the screw D the tension of the spring C is increased, which has the effect to compress the U-shaped bends of the compound bars and make them more rigid, in which condition they act, as stated, more promptly and with increased power, whereby the thermostat is more sensitive in its action to slight changes ot temperature, while by the reverse movement of said screw D'the tension of said spring C is diminished, and the opposite result is attained.

While I have shown and described a combination of several series of compound bars secured in sets to each other for increasing the length or range of movement of the valveactuating arm, it is obvious that when the required length of movement will permit a less number of series or a single series ot' compound bars may be used instead.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a thermostat forregulating temperature, the combination of two or more compound or thermostatic bars in a single series; two or more series of compound bars secured in set-s to each other; a lever for supporting` the several series ot compound bars; avalveactuating arm connected with the free ends of the second or outer series ot said compound bars; and means for adjusting the supporting-lever of said compound bars, substantially as and for the purpose specified.

2. In a thermostat for regulating temperature, the combination of two or more compound or thcrmostatic bars in a single series; a lever for holding and adjusting said series of compound bars; a screw for adjusting said lever in one direction; acounteracting-spring for supporting said lever against the bearing end ot said screw; an indicating-arm tor turning and adjusting said screw against said lever; and a dial located beneath said arm to indicate the proper adjustment of said screw, substantially as and for the purpose specified.

In a thermostat for regulating temperature, the combination of two or more compound or thermostatic bars in a single series; two or more series et compound bars securedy in sets to each other; a lever for holding and adjusting said series ot compound bars; a screw for adjusting said lever in one direction; a counteracting-spring for supporting` said lever against the bearing end ot said screw; an indicating-arm tor turning and adjusting said screw against said lever; a dial located beneath said arm to indicate the proper adjustment ot said screw; a valveactuating arm secured to the free end of the second or outer series of compound bars; a spring connnunicating between said actuating-arm and the sujiporting-lever ot said eompound bars; and means for regulating the tension of said counteraciing-spring between said actuating-arm and supporting-lever, all substantially as and for the purpose specified.

In testimony whereof I allix my signature in the presence ot' two witnesses.

ALFRED HOESCH.

Witnesses:

W. J. Woon, Cuantas W. Cousu. 

